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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c0f6887ad5392db2994b9d6b13eb3588c6735430e32661fac7731b4ec51a09' 
  AND token = '64vcaHT+jOB16s3Rpb4CIR5ymocicUZlnRUUb4yJjg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}